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MALPEDIA_Win_Chiser_Client_Auto

autogenerated rule brought to you by yara-signator

MalwareChiser ClientMalpedia signator rulesCreative Commons Attribution-ShareAlike 4.0Compiles with YARA-X
Author
Felix Bilstein - yara-signator at cocacoding dot com
Date
2026-05-04
Modified
2026-05-18
Score / Quality
75 / 75

What this rule detects

autogenerated rule brought to you by yara-signator

Associated malware family: Chiser Client.

It defines 10 patterns (0 text, 10 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

win-chiser-client-auto.yarCreative Commons Attribution-ShareAlike 4.0
rule MALPEDIA_Win_Chiser_Client_Auto : FILE
{
	meta:
		description = "autogenerated rule brought to you by yara-signator"
		author = "Felix Bilstein - yara-signator at cocacoding dot com"
		id = "1bf7733a-b27d-5245-8a73-b8cddcf167c9"
		date = "2026-05-04"
		modified = "2026-05-18"
		reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.chiser_client"
		source_url = "https://github.com/malpedia/signator-rules//blob/c901f97b7df03e41917da74c2a84b04c227316c2/rules/win.chiser_client_auto.yar#L1-L129"
		license_url = "N/A"
		logic_hash = "a1f8775a472f3a9fd5e419158a63b6c87d1e5ed0df024c103e8c519aecb3c0dc"
		score = 75
		quality = 75
		tags = "FILE"
		version = "1"
		tool = "yara-signator v0.6.0"
		signator_config = "callsandjumps;datarefs;binvalue"
		malpedia_rule_date = "20260422"
		malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
		malpedia_version = "20260504"
		malpedia_license = "CC BY-SA 4.0"
		malpedia_sharing = "TLP:WHITE"

	strings:
		$sequence_0 = { e8???????? 488b542458 4885db b923810000 480f45d1 4889542458 4d85ed }
		$sequence_1 = { 4d8bf0 4c8bfa 488bf9 488b5908 48895c2448 488bcb e8???????? }
		$sequence_2 = { 4c8d05e4ca0300 c7431828005700 ba50000000 c7431c69000000 488bcb e8???????? 4c8d05c6ca0300 }
		$sequence_3 = { 4883ec20 488bd9 488bc2 488d0d1dc20200 48890b 488d5308 33c9 }
		$sequence_4 = { 488bcf e8???????? 4863c3 66833c465c 740e 4863c5 }
		$sequence_5 = { 3d05005000 7562 807c243101 7552 488d542470 e8???????? 85c0 }
		$sequence_6 = { 7504 32c0 eb1b 488d156a0e0400 8bc8 e8???????? 85c0 }
		$sequence_7 = { 488d442460 48894c2450 4c8d4c2458 4889442420 e8???????? 85c0 }
		$sequence_8 = { 488bc8 e8???????? 4c634e08 488d146d00000000 4c8b06 4d03c9 488bc8 }
		$sequence_9 = { e8???????? e9???????? 6683f833 0f858d000000 }

	condition:
		7 of them and filesize < 714752
}

Strings (10 patterns)

IdentifierTypeValueModifiers
$sequence_0hex{ e8???????? 488b542458 4885db b923810000 480f45d1 4889542458 4d85ed }
$sequence_1hex{ 4d8bf0 4c8bfa 488bf9 488b5908 48895c2448 488bcb e8???????? }
$sequence_2hex{ 4c8d05e4ca0300 c7431828005700 ba50000000 c7431c69000000 488bcb e8???????? 4c8d05c6ca0300 }
$sequence_3hex{ 4883ec20 488bd9 488bc2 488d0d1dc20200 48890b 488d5308 33c9 }
$sequence_4hex{ 488bcf e8???????? 4863c3 66833c465c 740e 4863c5 }
$sequence_5hex{ 3d05005000 7562 807c243101 7552 488d542470 e8???????? 85c0 }
$sequence_6hex{ 7504 32c0 eb1b 488d156a0e0400 8bc8 e8???????? 85c0 }
$sequence_7hex{ 488d442460 48894c2450 4c8d4c2458 4889442420 e8???????? 85c0 }
$sequence_8hex{ 488bc8 e8???????? 4c634e08 488d146d00000000 4c8b06 4d03c9 488bc8 }
$sequence_9hex{ e8???????? e9???????? 6683f833 0f858d000000 }

Condition

7 of them and filesize < 714752

In plain words (Heuristic)

  • The file must be smaller than 714752 (a cheap guard that skips large files).
  • At least 7 patterns in the rule must match.

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References

Licence & attribution

Author: Felix Bilstein - yara-signator at cocacoding dot com

Source repository: Malpedia signator rules @ c901f97b7d

Licence: Creative Commons Attribution-ShareAlike 4.0 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 1bf7733a-b27d-5245-8a73-b8cddcf167c9

Metadata

version1
toolyara-signator v0.6.0
signator_configcallsandjumps;datarefs;binvalue
malpedia_rule_date20260422
malpedia_hasha182e35da64e6d71cb55f125c4d4225196523f14
malpedia_version20260504
malpedia_licenseCC BY-SA 4.0
malpedia_sharingTLP:WHITE

Tags:FILE